U.S. patent number 9,447,560 [Application Number 14/369,062] was granted by the patent office on 2016-09-20 for parallel linkage-type working apparatus for construction equipment.
This patent grant is currently assigned to Doosan Infacore Co., Ltd., SNU R&DB Foundation. The grantee listed for this patent is DOOSAN INFRACORE CO., LTD., SNU R&DB FOUNDATION. Invention is credited to Yong Hee Han, Kyung Ho Hwang, Hyuk Joong Kim, Jong Won Kim, Sun Ho Kim, Heung Keun Park, Young Sun Yoo.
United States Patent |
9,447,560 |
Kim , et al. |
September 20, 2016 |
Parallel linkage-type working apparatus for construction
equipment
Abstract
The present disclosure relates to a parallel linkage-type
working apparatus for construction equipment in which a parallel
lever and a parallel link operate to prevent a working tool from
bending inward so that, even if the working tool is raised, a
tilting phenomenon in which the working tool is inclined inward may
be prevented, and an amount of change in posture of the working
tool at each height may be reduced. Also, the parallel linkage-type
working apparatus is capable of increasing excavation ability or
power with a posture on the ground surface by supplying a larger
amount of hydraulic fluid at one time when working hydraulic
pressure is supplied to each cylinder head, in comparison with a
case in which working hydraulic pressure is supplied to a cylinder
rod.
Inventors: |
Kim; Hyuk Joong (Incheon,
KR), Yoo; Young Sun (Gyeonggi-do, KR),
Hwang; Kyung Ho (Incheon, KR), Kim; Jong Won
(Seoul, KR), Han; Yong Hee (Chungcheongbuk-do,
KR), Kim; Sun Ho (Gyeonggi-do, KR), Park;
Heung Keun (Gyeonggi-do, KR) |
Applicant: |
Name |
City |
State |
Country |
Type |
DOOSAN INFRACORE CO., LTD.
SNU R&DB FOUNDATION |
Incheon
Seoul |
N/A
N/A |
KR
KR |
|
|
Assignee: |
Doosan Infacore Co., Ltd.
(Incheon, KR)
SNU R&DB Foundation (Seoul, KR)
|
Family
ID: |
48697890 |
Appl.
No.: |
14/369,062 |
Filed: |
December 24, 2012 |
PCT
Filed: |
December 24, 2012 |
PCT No.: |
PCT/KR2012/011385 |
371(c)(1),(2),(4) Date: |
June 26, 2014 |
PCT
Pub. No.: |
WO2013/100521 |
PCT
Pub. Date: |
July 04, 2013 |
Prior Publication Data
|
|
|
|
Document
Identifier |
Publication Date |
|
US 20140341690 A1 |
Nov 20, 2014 |
|
Foreign Application Priority Data
|
|
|
|
|
Dec 27, 2011 [KR] |
|
|
10-2011-0143636 |
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
E02F
3/433 (20130101); E02F 3/3408 (20130101); B66F
9/065 (20130101); E02F 9/2271 (20130101) |
Current International
Class: |
E02F
3/43 (20060101); B66F 9/065 (20060101); E02F
9/22 (20060101); E02F 3/34 (20060101) |
Field of
Search: |
;414/722 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
1826448 |
|
Aug 2006 |
|
CN |
|
19702624 |
|
Jul 1998 |
|
DE |
|
02-085423 |
|
Mar 1990 |
|
JP |
|
H09-165772 |
|
Jun 1997 |
|
JP |
|
2001-020310 |
|
Jan 2001 |
|
JP |
|
2002-004321 |
|
Jan 2002 |
|
JP |
|
2004-036153 |
|
Feb 2004 |
|
JP |
|
2007186929 |
|
Jul 2007 |
|
JP |
|
10-2010-0057257 |
|
May 2010 |
|
KR |
|
10-998097 |
|
Dec 2010 |
|
KR |
|
90/06403 |
|
Jun 1990 |
|
WO |
|
Other References
Japanese Office Action dated May 26, 2015 for Japanese Application
No. 2014-549983, 3 pages. cited by applicant .
Chinese Office Action dated Jun. 30, 2015 for Chinese Application
No. 201280064936.X, 7 pages. cited by applicant .
Search Report dated Apr. 16, 2013 and written in Korean with
English translation for International Patent Application No.
PCT/KR2012/011385 filed Dec. 24, 2012, 5 pages. cited by applicant
.
European Search Report dated Nov. 30, 2015 for European Application
No. 12863324.5, 7 pages. cited by applicant.
|
Primary Examiner: McClain; Gerald
Assistant Examiner: Jarrett; Ronald
Attorney, Agent or Firm: Veldhuis-Kroeze; John D. Westman,
Champlin & Koehler, P.A.
Claims
The invention claimed is:
1. A parallel linkage-type working apparatus for use with
construction equipment, comprising: a base frame which is
configured to connect to a front side of a traveling apparatus; a
lift arm which has one end configured to rotatably connect to the
base frame, and the other end configured to rotatably connect to a
bucket; a lift cylinder which has one end configured to rotatably
connect to the base frame, and the other end configured to
rotatably connect to a central side in a length direction of the
lift arm; a parallel link which has one end configured to rotatably
connect to the base frame; a parallel lever which has a lower
portion configured to rotatably connect to the other end of the
parallel link; a bucket cylinder which has one end configured to
rotatably connect to an upper portion of the parallel lever; a tilt
lever which has an upper portion configured to rotatably connect to
the other end of the bucket cylinder, and a lower portion
configured to rotatably connect to the bucket through a push link
configured to rotatably connect to the bucket; and connecting shaft
portions which have end portions configured to rotatably connect to
a central side of the parallel lever, and the other end portions
are configured to rotatably connect to a central side of the tilt
lever; wherein the parallel link and the parallel lever are
configured to rotate relatively to each other in a direction in
which a first hinge axis between the parallel link and the base
frame and a second hinge axis between the parallel lever and the
bucket cylinder move toward each other when the lift arm is raised
without operating the bucket cylinder.
2. The parallel linkage-type working apparatus of claim 1, wherein
the connecting shaft portions include: a fixed shaft which has both
ends that are fixed to a pair of lift arms, respectively; a first
connecting shaft which has one end fixed to the fixed shaft, and
the other end configured to rotatably connect to the central side
of the parallel lever; and a second connecting shaft which has one
end fixed to the fixed shaft, and the other end configured to
rotatably connect to the central side of the tilt lever.
3. The parallel linkage-type working apparatus of claim 2, wherein
a side cross section of the parallel lever has an isosceles
triangle shape, and the parallel link, the bucket cylinder, and the
first connecting shaft are configured to rotatably connect in the
vicinity of vertices of the isosceles triangle shape, respectively.
Description
CROSS-REFERENCE TO RELATED APPLICATION
This Application is a Section 371 National Stage Application of
International Application No. PCT/KR2012/011385, filed Dec. 24,
2012 and published, not in English, as WO 2013/100521 on Jul. 4,
2013.
FIELD OF THE DISCLOSURE
The present disclosure relates to a parallel linkage-type working
apparatus for construction equipment, and more particularly, to a
parallel linkage-type working apparatus for construction equipment,
capable of preventing a tilting phenomenon in which a working tool
(for example, a bucket) is inclined inward even if the working tool
is raised by a lift arm, and increasing force (for example,
excavating ability) at a posture on the ground surface while
reducing an amount of change in posture at each height of the
working tool.
In addition, the present disclosure relates to a parallel
linkage-type working apparatus for construction equipment in which
a main angle specification for operating a linkage is similar to a
typical work environment, which has been used from the past, such
that it is possible to enable even a worker who is a beginner to
quickly become accustomed to using the apparatus without any
separate training or perceiving a sense of difference.
BACKGROUND OF THE DISCLOSURE
Particularly, a small scale shovel series excavator or a wheel
loader among various types of construction equipment has a working
apparatus at a front side thereof, and the working apparatus
includes a linkage which is operated by a hydraulic device, and a
working tool such as a bucket which is connected to the
linkage.
Therefore, the equipment may perform work for excavating and
scooping objects such as soil, fertilizer, and snow by using the
working tool with a posture on the ground surface, and may perform
various types of work functions such as dumping work when the
working tool is raised by a lift arm.
Meanwhile, the aforementioned equipment is known through various
documents including Korean Patent No. 998097 and Korean Patent
Application Laid-Open No. 2010-57257, and particularly equipment
called `Z BAR` as illustrated in FIG. 1 and equipment called
`Parallel or Tool Carrier (TC)` as illustrated in FIG. 2 are
currently used widely in a construction site.
However, in the equipment called the `Z BAR`, since a tilting (or
also called `crowd`) phenomenon occurs in which horizontality of
the bucket cannot be maintained with respect to the ground surface,
but the bucket is inclined inward when the bucket (working tool)
connected to a linkage is raised as illustrated in FIG. 1, an
amount of change in posture at each height of the bucket is large,
and as a result, it is difficult for a worker to operate the
equipment.
In contrast, in the equipment called the `Parallel or Tool Carrier
(TC)`, since horizontality of a fork is continuously maintained
with respect to the ground surface when the fork (working tool)
connected to a linkage is raised as illustrated in FIG. 2, there is
little change in posture at each height of the fork, or an amount
of change in posture at each height of the fork is very small, but
there is a problem in that force, which can be applied by the fork,
is small.
That is, due to a structural problem of the linkage that operates
the working tool such as the bucket or the fork in the related art,
there is a problem in that an amount of change in posture at each
height is large when the working tool is raised, or excavating
ability of the bucket or force of the fork is small when there is
no change in posture at each height.
The discussion above is merely provided for general background
information and is not intended to be used as an aid in determining
the scope of the claimed subject matter.
SUMMARY
This summary and the abstract are provided to introduce a selection
of concepts in a simplified form that are further described below
in the Detailed Description. The summary and the abstract are not
intended to identify key features or essential features of the
claimed subject matter, nor are they intended to be used as an aid
in determining the scope of the claimed subject matter.
The present disclosure has been made in an effort to resolve the
aforementioned problem, and an aspect of object of the present
disclosure is to provide a parallel linkage-type working apparatus
for construction equipment, capable of preventing a tilting
phenomenon in which a working tool is inclined inward even if the
working tool is raised by a lift arm, and increasing force at a
posture on the ground surface while reducing an amount of change in
posture at each height of the working tool.
In addition, another an aspect of object of the present disclosure
is to provide a parallel linkage-type working apparatus for
construction equipment in which a main angle specification for
operating a linkage is similar to a typical work environment, which
has been used from the past, such that it is possible to enable
even a worker who is a beginner to quickly become accustomed to
using the apparatus without any separate training or perceiving a
sense of difference.
To this end, a parallel linkage-type working apparatus for
construction equipment according to the present disclosure
includes: a base frame which is connected to a front side of a
traveling apparatus; side brackets which are provided at both upper
sides of the base frame, respectively; a lift arm which has one end
rotatably connected to an upper portion of the side bracket, and
the other end rotatably connected to a bucket; a lift cylinder
which has one end rotatably connected to a lower portion of the
side bracket, and the other end rotatably connected to a central
side in a length direction of the lift arm; a center bracket which
is provided at an upper central side of the base frame; a parallel
link which has one end rotatably connected to the center bracket; a
parallel lever which has a lower portion rotatably connected to the
other end of the parallel link; a bucket cylinder which has one end
rotatably connected to an upper portion of the parallel lever; a
tilt lever which has an upper portion rotatably connected to the
other end of the bucket cylinder, and a lower portion rotatably
connected to the bucket through a push link; and connecting shaft
portions which have one end portions rotatably connected to a
central side of the parallel lever, and the other end portions
rotatably connected to a central side of the tilt lever.
In this case, the connecting shaft portion may include a fixed
shaft which has both ends fixed to a pair of lift arms,
respectively; a first connecting shaft which has one end rotatably
connected to the fixed shaft, and the other end rotatably connected
to a central side of the parallel lever; and second connecting
shafts which are provided at both sides of the first connecting
shaft, and have one ends rotatably connected to the fixed shaft,
and the other ends rotatably connected to a central side of the
tilt lever.
In addition, a side cross section of the parallel lever may have an
isosceles triangle shape, and the parallel link, the bucket
cylinder, and the first connecting shaft may be rotatably connected
in the vicinity of vertices of the isosceles triangle shape,
respectively.
In addition, the lift cylinder and the bucket cylinder may be
installed so as to be directed forward, respectively, in a
direction in which a cylinder rod is directed toward the bucket,
and working hydraulic pressure may be supplied to a cylinder head
side.
According to the present disclosure as described above, the
parallel lever and the parallel link operate to prevent the working
tool from bending inward so that, even if the working tool is
raised, a tilting phenomenon in which the working tool is inclined
inward may be prevented, and an amount of change in posture of the
working tool at each height may be reduced.
In addition, when working hydraulic pressure is supplied to the
head side of each of the cylinders, a larger amount of hydraulic
fluid may be supplied at one time in comparison with a case in
which working hydraulic pressure is supplied to the cylinder rod
side, such that excavating ability or power may be increased at a
posture on the ground surface.
In addition, like the related art, the parallel linkage-type
working apparatus for construction equipment has two cylinders for
operating a parallel linkage, also has a similar operating
relationship to that of the related art, and has a main angle
specification for operating the linkage which is similar to a
typical work environment, so as to enable even a worker who is a
beginner to quickly become accustomed to using the apparatus
without any separate training or perceiving a sense of
difference.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is an example illustrating construction equipment in the
related art which operates a working tool by a linkage.
FIG. 2 is another example illustrating the construction equipment
in the related art which operates the working tool by the
linkage.
FIG. 3 is a perspective view illustrating a parallel linkage-type
working apparatus for construction equipment according to the
present disclosure.
FIG. 4 is a side perspective view illustrating the parallel
linkage-type working apparatus for construction equipment according
to the present disclosure.
FIG. 5 is a perspective view illustrating a cylinder of the
parallel linkage-type working apparatus for construction equipment
according to the present disclosure.
FIG. 6 is a continuous view illustrating an operational state of
the parallel linkage-type working apparatus for construction
equipment according to the present disclosure.
DESCRIPTION OF MAIN REFERENCE NUMERALS OF DRAWINGS
110: Base frame 111: Side bracket 112: Center bracket 120: Lift arm
130: Lift cylinder 140: Parallel link 150: Parallel lever 160:
Bucket cylinder 170: Tilt lever 171: Push link 181: Fixed shaft
182: First connecting shaft 183: Second connecting shaft 192: First
hinge axis 194: Second hinge axis B: Bucket
DETAILED DESCRIPTION
Hereinafter, a parallel linkage-type working apparatus for
construction equipment according to an exemplary embodiment of the
present disclosure will be described in detail with reference to
the accompanying drawings.
However, hereinafter, a bucket will be described as an example of a
working tool that is operated by a parallel linkage, and a wheel
loader will be described as an example of various types of
construction equipment.
However, the present disclosure is not limited thereto, and it is
obvious that various tools such as a fork may be used as the
working tool, and various types of equipment such as shovel series
heavy equipment may also be applied as the construction
equipment.
As illustrated in FIGS. 3 and 4, a parallel linkage-type working
apparatus for construction equipment according to the present
disclosure includes a base frame 110, side brackets 111, lift arms
120, and lift cylinders 130 that are configured to raise or lower a
bucket B that is a working tool.
In addition, the parallel linkage-type working apparatus includes a
center bracket 112, a parallel link 140, a parallel lever 150, a
bucket cylinder 160, a tilt lever 170, and connecting shaft parts
181, 182, and 183 that are configured for maintaining a posture of
the bucket B that is being raised or lowered. The connecting shaft
parts 181, 182, and 183 include a fixed shaft 181, a first
connecting shaft 182, and a second connecting shaft 183.
In this case, the base frame 110 is a part that is connected to a
front side of the wheel loader in which a traveling apparatus and a
driver seat are provided, and typically provided with a steering
bracket at a rear end so that the base frame 110 may be rotatably
connected to the front side of the wheel loader.
Therefore, the aforementioned configuration allows the working
apparatus to be rotated in a left and right direction at a designed
angle at the front side of the wheel loader, and supports the
working apparatus.
The side brackets 111 are provided at both upper sides of the base
frame 110, respectively, and for example, the side bracket 111 has
a shape in which an approximate `` shaped bracket is elongated in
an upward and downward direction, and an opening portion thereof is
fixed so as to be directed forward.
In addition, rotation brackets are fixedly inserted at upper and
lower portions of a portion where the lift arm 120 and the lift
cylinder 130 are connected, respectively, and the lift arm 120 and
the lift cylinder 130 are rotatably connected to the upper and
lower portions of the side bracket 111, respectively.
The lift arms 120 serve to raise or lower the bucket B by receiving
power from the lift cylinder 130, and are connected to the side
brackets 111, respectively, which are fixed to both sides of the
base frame 110, respectively, one end of the lift arm 120 is
rotatably connected to the upper portion of the side bracket 111,
and the other end of the lift arm 120 is rotatably connected to the
bucket B.
For example, the lift arm 120 is formed in an `S` shape that is
curved overall, and has a long length.
The lift cylinder 130 serves to operate the lift arm 120, a
hydraulic cylinder is used as the lift cylinder 130, one end of the
lift cylinder 130 is rotatably connected to the lower portion of
the side bracket 111, and the other end of the lift cylinder 130 is
rotatably connected to a central side in a length direction of the
lift arm 120. A pair of lift cylinders 130 operates a pair of lift
arms 120, respectively.
Particularly, a cylinder head side of the lift cylinder 130 is
connected with the side bracket 111 as the one end, a tip portion
of a cylinder rod withdrawn from the cylinder is connected to the
lift arm 120 as the other end, and working hydraulic pressure,
which withdraws the cylinder rod, is supplied to the cylinder head
side.
As illustrated in FIG. 5, a space in the cylinder is smaller as
much as a volume of the cylinder rod at the cylinder rod side than
at the cylinder head side. Therefore, in a case in which working
hydraulic pressure is supplied to the cylinder head side, a larger
amount of hydraulic fluid may be supplied at one time such that a
stronger force is provided in comparison with a case in which
working hydraulic pressure is supplied to the cylinder rod
side.
In addition, the lift cylinder 130 is connected to a curved portion
formed at the central side of the `S` shaped lift arm 120, such
that the lift arm 120 may be pushed by a stronger force when the
cylinder rod of the lift cylinder 130 is withdrawn.
The center bracket 112 is provided at an upper central side of the
base frame 110, and disposed between the side brackets 111, and a
hinge bracket is fixed in the center bracket 112, such that the
parallel link 140 is rotatably supported by inserting the parallel
link 140 into the hinge bracket, and thereafter assembling a
rotation pin thereto.
One end of the parallel link 140 is rotatably connected to the
center bracket 112, and the other end of the parallel link 140 is
rotatably connected to a lower portion of the parallel lever
150.
The parallel lever 150 serves to operate the bucket cylinder 160
and the bucket B in conjunction with each other, and on the basis
of the drawings, the other end of the parallel link 140 is
rotatably connected to a lower portion of the parallel lever 150,
the head side of the bucket cylinder 160 is rotatably connected to
an upper portion of the parallel lever 150, and a first connecting
shaft 182 of the connecting shaft portions 181, 182, and 183 is
rotatably connected to a central axis of the parallel lever
150.
Particularly, a side cross section of the parallel lever 150 has an
approximate isosceles triangle shape, and in this case, the
parallel link 140, the bucket cylinder 160, and the first
connecting shaft 182 of the connecting shaft portions 181, 182, and
183 are rotatably connected in the vicinity of the vertices,
respectively, such that the parallel link 140, the bucket cylinder
160, and the first connecting shaft 182 of the connecting shaft
portions 181, 182, and 183 are stably operated in conjunction with
each other.
The bucket cylinder 160 serves to adjust an angle of the bucket B
so as to form an excavating posture or a dumping posture, a
hydraulic cylinder is used as the bucket cylinder 160, one end of
the bucket cylinder 160 is rotatably connected to the upper portion
of the parallel lever 150, and the other end of the bucket cylinder
160 is rotatably connected to an upper portion of the tilt lever
170 as described above.
Like the lift cylinder 130, the cylinder head side of the bucket
cylinder 160 is connected to the parallel lever 150 as the one end,
the tip portion of the cylinder rod, which is withdrawn from the
cylinder, is connected to the tilt lever 170 as the other end, and
in this case, working hydraulic pressure is supplied to the
cylinder head side such that a stronger force may be provided.
The tilt lever 170 serves as a lever, and transmits power of the
bucket cylinder 160 to the bucket B, the upper portion of the tilt
lever 170 is rotatably connected to the other end of the bucket
cylinder 160, and the lower portion of the tilt lever 170 is
rotatably connected to the bucket B through a push link 171. That
is, the push link 171 is rotatably connected to the lower portion
of the tilt lever 170, and the push link 171 is rotatably connected
to the bucket B.
The connecting shaft portions 181, 182, and 183 serve to rotatably
support the tilt lever 170, and have one end portions rotatably
connected in the vicinity of a center of the parallel lever 150,
and the other end portions rotatably connected in the vicinity of a
center of the tilt lever 170.
For example, the connecting shaft portions 181, 182, and 183
include a fixed shaft 181, the first connecting shaft 182, and a
second connecting shaft 183, both ends of the fixed shaft 181 are
fixed to the pair of lift arms 120, respectively, the first
connecting shaft 182 is fixed to a central side of the fixed shaft
181, and the second connecting shaft 183 is fixed to the fixed
shaft 181 at both end sides of the first connecting shaft 182.
In addition, one end of the first connecting shaft 182 is fixed to
the fixed shaft 181, the other end of the first connecting shaft
182 is rotatably connected to the central side of the parallel
lever 150, one end of the second connecting shaft 183 is fixed to
the fixed shaft 181, and the other end of the second connecting
shaft 183 is rotatably connected to the central side of the tilt
lever 170.
According to the aforementioned configuration, when a worker
operates the lift cylinder 130 so as to insert or withdraw the
cylinder rod as illustrated in FIG. 6, the lift arm 120 is rotated
in a state in which the lift arm 120 is supported on the side
bracket 111 so as to raise or lower the bucket B.
In addition, when the lift arm 120 is raised or lowered, the
parallel link 140, the parallel lever 150, the bucket cylinder 160,
and the tilt lever 170 in addition to the connecting shaft portions
181, 182, and 183 connected to the lift arm 120 are raised or
lowered together with the lift arm 120.
In addition, when the worker operates the bucket cylinder 160 so as
to insert the cylinder rod in this state, the bucket B is inclined
forward while the upper portion of the tilt lever 170 is pulled,
and on the contrary, when the cylinder rod is withdrawn, the bucket
B is inclined inward while the upper portion of the tilt lever 170
is rotated forward, such that various types of work such as
excavating and dumping may be performed.
Particularly, according to the present disclosure, the parallel
link 140 and the parallel lever 150 are automatically folded in
accordance with an ascending angle when the bucket B is raised by
the lift arm 120, and as a result, a tilting (or `crowd`)
phenomenon in which the bucket B is inclined inward when the bucket
B is raised is prevented, such that horizontality of the bucket B
is always maintained with respect to a working surface. That is,
according to the present disclosure, an amount of change in posture
at each height of the bucket B is very small.
Therefore, when the worker adjusts an ascending height while seeing
the bucket B, the worker may determine the ascending height based
on the same reference, and as a result, it is possible to precisely
control the height.
In addition, the posture is prevented from being continuously
changed regardless of a manipulation of the worker when the bucket
B is raised, and as a result, the bucket B is easily inclined with
a uniform posture as much as required when the angle of the bucket
B is adjusted to perform dumping.
In addition, the respective central portions of the tilt lever 170
and the parallel lever 150 are independently rotatably connected to
the connecting shaft portions 181, 182, and 183, such that the
postures of the tilt lever 170 and the parallel lever 150 may be
more precisely adjusted when the bucket cylinder 160 is operated,
thereby further improving the aforementioned effect.
In addition, when working hydraulic pressure is supplied to the
head side of each of the cylinders, a larger amount of hydraulic
fluid may be supplied at one time in comparison with a case in
which working hydraulic pressure is supplied to the cylinder rod
side, such that excavating ability may be further increased at a
posture on the ground surface.
In addition, the bucket B is raised by the lift cylinder 130, the
angle of the bucket B is changed by the bucket cylinder 160, and an
operational specification is similar to a typical work environment
of a wheel loader, which has been used from the past, such that it
is possible to enable even a worker who is a beginner to quickly
become accustomed to using the apparatus without any separate
training or perceiving a sense of difference.
Specific exemplary embodiments of the present disclosure have been
described above. However, it will be understood by a person with
ordinary skill in the technical field to which the present
disclosure pertains that the spirit and scope of the present
disclosure are not limited to the specific exemplary embodiments,
and various corrections and modifications may be made without
departing from the subject matter of the present disclosure.
Therefore, the exemplary embodiments disclosed above are set forth
to provide a complete understanding of the scope of the disclosure
to a person with ordinary skill in the technical field to which the
present disclosure pertains, such that it should be understood that
the exemplary embodiments are described for illustration in all
aspects and are not restrictive, and the present disclosure will
only be defined by the scope of the claims.
The present disclosure may be used in the parallel linkage-type
working apparatus for construction equipment that may prevent a
tilting phenomenon in which the working tool is inclined inward,
and may reduce an amount of change in posture at each height of the
working tool.
* * * * *